“My brother ought not to have treated me thus.' True: but he must see to that. However he may treat me, I must deal rightly by him. This is what lies with me, what none can hinder.”

Ch. VII, Social Problems in the Forest, p. 130 https://archive.org/stream/ontheedgeofthepr007259mbp#page/n163/mode/2up (1924 translation by Ch. Th. Campion); Schweitzer later repudiated such statements, saying "The time for speaking of older and younger brothers has passed.", as quoted in [Forrow, Lachlan, Foreword, Russell, C.E.B., African Notebook, Syracuse University Press, Albert Schweitzer library, 2002, 978-0-8156-0743-4, http://books.google.com/books?id=qa-TVXEkY3sC&pg=PR13, 23 June 2017, xiii]
Variant:
The African is my brother — but he is my younger brother by several centuries.
As quoted in The Observer (23 October 1955)
On the Edge of the Primeval Forest (1922)

Source: The Science of Rights 1796, P. 132

Trátame como debes tratarme, no como merezco ser tratado.
Voces (1943)

1900s, A Square Deal (1903)
Context: It is not enough to be well-meaning and kindly, but weak; neither is it enough to be strong, unless morality and decency go hand in hand with strength. We must possess the qualities which make us do our duty in our homes and among our neighbors, and in addition we must possess the qualities which are indispensable to the make-up of every great and masterful nation -- the qualities of courage and hardihood, of individual initiative and yet of power to combine for a common end, and above all, the resolute determination to permit no man and no set of men to sunder us one from the other by lines of caste or creed or section. We must act upon the motto of all for each and each for all. There must be ever present in our minds the fundamental truth that in a republic such as ours the only safety is to stand neither for nor against any man because he is rich or because he is poor, because he is engaged in one occupation or another, because he works with his brains or because he works with his hands. We must treat each man on his worth and merits as a man. We must see that each is given a square deal, because he is entitled to no more and should receive no less.

India Today in: Gulzarilal Nanda: Profile in austerity http://indiatoday.intoday.in/story/at-98-two-time-interim-pm-gulzarilal-nanda-is-the-epitome-of-gandhian-ideals/1/283506.html, India Today, 15 May 1996.

A response to the Nazi book burnings, "The Burning of the Books"

Source: Pygmalion